I am planning to replace my car's spark plugs my self for the first time so I watched a couple of youtube videos.
Unfortunately, these video tutorials made me more confused.
They are talking about a spark plug gap thingy and correct torque or tightness. I can't even find a store to buy that gap gauge.
Are they really important or can I just buy a plug that is designed for my vehicle and just plug it in?

Any advice? Thanks!